Refrigerated Solutions Group LogiTemp & LogiTemp Plus Controller Diagnostics

When equipment isn’t running, the controller can sometimes be an ally in discovering what’s wrong. That way you can get through troubleshooting more efficiently and get to work on repairs. If you aren’t certain how to navigate the controls and what certain display codes mean, this guide has you covered. We’ll get you through everything you need to know for Refrigerated Solutions Group LogiTemp and LogiTemp Plus controller diagnostics.

This guide is applicable to any Norlake or Master-Bilt refrigeration unit with the LogiTemp or LogiTemp Plus controller. 

RSG Controller Diagnostics

• Step 1. Initial controller readings – When first approaching the controller, it’ll be alternating with a few different readouts. First it will indicate the mode the controller is in such as refrigeration mode (rEF). Then it will show what readout the controller is doing such as the room temperature (rtP).
• Step 2. Accessing additional controller information – To see what else the controller can tell you, press the down arrow key on the controller. It should first show rtP for the room temperature setting.
• Step 3. SUP readings – Pressing the down arrow again from rtP will take you to super heat (SUP). You can press ENTER to select this readout and see what the current system super heat reading is. This should read between 8-10 degrees when installed on a functioning walk in refrigeration unit. 
• Step 4. Pressure settings – Press BACK to return to the parameter list. You can then press the down arrow again to proceed to pressure setting (PrS). You can then press ENTER to view the pressure setting of the outlet the evaporator is running at. This required values for this is determined by the refrigerant type and the temperature application the system is in. 
• Step 5. Suction line temperature – Press the BACK button again to exit pressure settings. Then use the down arrow to scroll to temperature readouts. The first read out is suction line temperature (tSC). Press ENTER to view the temperature value. 
• Step 6. Saturation temperature – Press BACK button to return to the parameter list. Press the down arrow again to scroll to saturation temperature (tSt). To view this value, press ENTER. This is a calculated value based on suction line temperature and pressure setting. 
• Step 7. Coil temperature – Press the BACK button to exit back to the parameter list. Using the down arrow, progress to the coil temperature (tCL). Press ENTER to view the temperature. Coil temperature should be around 10 degrees colder than the current box temperature. 
• Step 8 Electronic expansion valve open percentage – Exit to the parameter list by pressing the BACK button and using the down arrow to scroll to the next readout. This will be the final option which is the open percentage of the electronic expansion valve (oPn). To view it, press the ENTER button. This value should be 20% – 40% open in a normal operation system close to setpoint depending on the time of year. 
• Step 9. Exiting parameter list – Press the BACK button twice to return to the alternating display and exit the list of parameters.